<!DOCTYPE html>
<html lang="zh-CN">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    body {
      margin-top: 100px;
      font-size: 100px;
      text-align: center;

      /*
        text-shadow: color offset-x offset-y blur-radius;
         ● color          阴影颜色
         ● offset-x       阴影偏移量
         ● offset-y
         ● blur-radius    阴影模糊半径

        可以设置多个阴影，用 , 分隔
       */
      text-shadow: red 5px 5px 3px, orange 10px 10px 3px;
    }
  </style>
</head>

<body>
  Hello world!
</body>

</html>